Three-ciscuit low-loss tttner



BEST AVAILABLE COP;

Nov. 9, 1926. 1506,737

B. w. SUCKLE ET AL THREE-CIRCUIT LOW LOSS TUNER Filed Sept. 10. 1924 2 Sheets$heet 1 ,Bend'amtln M fiawlfie Tkomas JMathe urs $1 (2 W "I v BEST AVAILABLE Nov; 9, 1926.

B. w. sucKLE-ET AL THREE-CIRCUIT LOW Loss TUNER 2 Sheets-Sheet 2 Filed Sept. 10. 1924 5435.11, cam; 12. #4 54 t gwuanto'o fierjamm WSuc/fle Thoma/5- J Mathews Patented Nov. 9, 1926.

BEST AVAILABLECOPX:

PATENT THREE-GIRCUIT LOW-LOSS TUNER. 3

. This invention has reference to tuning devices 'foriradio or wireless telegraphs. I

In '-radi o 'receiving sets generally, and more particularlyin the less expensive sets,

great diiiiculty' is encountered in the recep-- tion from stations at a great distance and frequently lilifiicultyjis encountered even when receiving from stations close by. This nevertheless fcapable of very sharp and quick tuning andefiicientdetuning.

.A'iurther objectofour inventlon is the provision of acircuit for the reception of electric impulses at radio frequencies which isfsimplelincharacter and of a hook up which is efficient in operation and inexpensivein is manufacture. I

A stil-llfurther object of our invention is the provision of a circuit for the reception of electric impulses at radio frequencies in \vhichtheprimary is untuned so as to enable sharp 'tuning'and increased volume.

A still further object of our invention is the provision of a circuit for the reception of electricimpulses' at radio frequencies in which the secondary is wound to work with a variable condenser of .0005 M. F. D. capacity.

A further object of our invention is the provision of a three circuit tuner having inductance memberseach one of which is in the form of a flat coil and self supporting, said coils being wound so as to put the necessary amount of wire in the least amount of space and being supported without the use of chemicals, tubing, or any other insulating material and being adapted to be mounted at an angle o45 degrees. A.

A further object of the invention is the provision of a three circuit tuner having inductance members each one of which is woundinsuch a manner as to reduce the dielectric losses to a minimum.

A still'further object of the invention is the provision ofa three circuit tuner having two'fijxed. coils mountedat an angleof degrees and a movable-flat coil'mounted in the fixed coils; the angular displacement of the movable coil about its axis-being greater Application filed September 10, 1 24. Seria1.No.73G ,95 6. I A l." I

than the angular displacement/of theimov- -5 able coil with respect to the'fixed coils. "f I A still further object ofth invention is'j the provision'of means whereby the movable and fixed coils or units of.-a three circuit tuner may be mounted upona panel "with a minimum ot-"partsland in an eflicient durablemanner. if i A further object of our I U V provision of novehmounting us 's lthat permit a compactassemhly'ofath circuit tuner.

A still further objectjof o ir -inventi the provision of novelniounting means to a movable coil ina three circuit tunerwhich" permit of a 180 degree' angular displacement. of the movable coil." i A still further object of' our-inventioni's the provision generally of a n'ew-and'jsim-i plified receiving apparatus and of agnew, 'improved and inexpensive arrangement bf in- 5 ductance coils therefor. f 11);

With the foregoing andbther objects'fliii, View which will appear asthe. description proceeds, my invention consists in the construction, arrangement, and combination "of parts of my device whereby the" objects'con y templated are attained, as hereinafter more, fully set forth, pointed outinthe appended claims, and illustrated in the accompanying drawings, in which: i H I Figure l is a viewin side elevation'of a low loss three circuit tuner mounted upon a panel in accordance with the present invention. 4 a

Figure 2 is a vertical section through the circuit tuner showing in full lines thecoils in the position of maximumcoupling and in dotted lines the coils in the position of minimum coupling. Figure 3 is a front plan view looking in the direction of arrow C. v I

Figure A is a topplan view looking in t-he directionor arrow If).v r r .r

Figure 5 is a plan 'vie lof one of the fixed cois. Y Figure 6 is a development of a portion of the winding taken-0n line,6'f6fof Figu es; Figure 7 is'a front lan ,view ofiithefmovf able coil illustrating to e acourseiof the wire, Figure 8 is a evievvin. perspectiveofwa casting for'moun'ting .th'e fixedcoilsf 1., Figure 9 ,is acros'ssectioni'of the'castin'g shown in Figure 8.

Figure is a detailed view showing the insulating eyelets used with the casting of Figure8. 7 p

Figurell is a view in side elevation of the mounting nieans for the movable (3011.

Figure 12 is a view in rear elevation of the mounting" means shown in Figure 11; and

Figure 13 is a View in perspective of the mounting means of Figure 11.

Throughout the drawings like reference characters indicate like parts.

Refer-ring tothe drawings more particularly, P'i'ndi oates'a panel and C a casting uponjwhich' are mounted the two stationary or liked coilsS'and" S The. casting C 1 comprises a vertical, body pprt ioirrand a fork 2 havinglegs or arms3 a'nd' extending at an angle of degrees fronrthe upper: end of the vertical body portion,' "thej'lgs.'or' arms being provided with openingsflfforl the reception of "instill-Lt ing' eyel'tsGJ Aboss"or"'kn'o5"7'is cast integ alwith the vertical body portion at' its lower. end. Theboss' or knob 7 is threaded oh its outer side as'at 8 for receiving the mu; 9' which. detachably secures the casting C'to the panel P. 'A washer 10 is inserted between the paneLP and the nut 9. A bore 11 adapted to receiveza shaft 1211s drilled through th'eknob 7 and casting 1, the d1- a met'er ot' tlie bore through the knob being greater than'it's diameter through the cast?- 1ng,' thus forming a shoulder 13 against which-abuts the enlarged portion 14 of the shaft 12. A pin 15' upon the shaft 12 is ad Eted to enga e a leaf spring 10' secured to t "e casting C y,'suitable fastening means 17 to limit the rotation of the shaftli and to hold the shaftin any adjusted position. A dial D having a knob K is mounted on the enlarged portion 14 of the shaft for rotation ofthe latter.

The stationary or fi xed'coils S and S? are preferably in thetorm of flat or pancake coils the coil S being shown for purposes of. illustration as the primary and the coil S as the secondary. These coils areformed by winding the wire on a form comprising ahub and detachablespolies the wire being wound in layers lengthwise of two spokes, then crosswise betweenthe secondand third spokes; lengthwise of the third and fourth spokes, and so onun til a coil of the desired size i's'obtain'ed. The spokes are then re.- moved and the hub allowedto'd'rop out, leaving'a 'coihas'shown in the drawings. The coil thus formedis flat, self supporting; and: hasa tendency to avoid any distributed art-cityfamoath i windinssan' new. the iiowf of; radioj'irequencyj" through "the coil with the. least -amoiint ;of" resistancefwhile reducingidielet ficlesses to a minimum due to the awaitede- 11 earsor insulating ma ri ls are q d i g'frje aln he. She-B5? BEST AVAILABLE COP\ of the coils when completed. The secondary coil is wound to work with a variable condenser of .0005 M. F. D. capacity thus enabling tuning; 'to: a range off 250 to 550 meters. The coils may be wound of a single strand of wire but Litzendraht wire is preferred. If. desired, strips of adhesive tape 18 may be employed to hold the coils in pancake form. The primary and secondary coils S and S are mounted on the fork of the casting C' at a 45'' degree angle to panel P as shown in Figures 1 and 2 by means of suitable binding posts 19 and 20which pass through insulating eyelets 6 and held 'thereon. by nuts 27, The primary coilS is secured to the binding" posts 19 by means of iusulatinglstrips 21' and 22 and nuts 23 and 2.4.1 as shown in Figures 2; and 3. The secondary coil' S" is. secured to binding posts 20 by means ot'insulating s'trips'25 an'dnuts" Binding posts 28ffare, attached to the lower end ,ofjtheeo'il- Sjjb jmefansof insulating strip's29 an-(1130:1511 nuts" 31' as. shown in Figure 3. i

Mounted on the forward end of the shaft '12 is a circularc'ollar 32 comprising a; body 33 andboss or knob 34 h'avinga bore 35 drilled at a degreev angle to the vertical plane of the body 33; and a'dbptedto receive the. forward end of the shaft 12 which is hold therein by set'screw 36.- The' movable.

coil or rotor 37 is attached to the front face of the collar 32 by means of the screw 38 adapted to be inserted'into threadedopening 39. The rotor on movable coil 37 is positioned in the plane of the secondar coil S/and by turning; shaft 12' throu knob K it can be rotated-horn its fu'llli'ne position in Fig. Z-to the dotted. line position shown in the same view which position places the rotor at right angles-to the primary andsecondary coils. As a result of this construction. it will be noted that the movable coil has an angular displacement of- 180 degrees about its own axis while moving. from the plane of the secondary coil to its perpendicular position. The pin 15' limits the rotation ottlie rotor. The'rotorj being wound' on a spider-web form; and movable through. 18.0 degrees permits of coupling. when tuned from minimum to maximum. regenerating points. By virtue of the fact that no insulating; supporting material for our particular for'ni of primary and secondary coils. isemployed and} since the movable coil may be. rotated. through an angle of180 degrees. toje'fiectmoyemenr qi the rotor throughjan. anglejof 90' degrees. with respect to the. stationary coils; very sharp. quick tuning; as.. well as eificien't detmiin glmaybeohtainedr Frorn th'e. foregoing'idscripjion it, will be seen thatfire :liave devisedl a. 'ci'r'e'uifi'ien. the. tfsll t ie fip 1,606,737 BESTAVAILABLE COP B cientin operation, and inexpensive in manufacture, the inductive members of which are wound so as to reduce dielectric losses to a minimum and in which the movable and fixed coils may be mounted on a panel with a minimum of parts, the movable coil being capable of 180 degree angular displacement and the entire assembly and arrangement of parts permitting of sharp and quick tuning as well as efficient detuning.

lVe would state in conclusion that while the illustrated example constitutes a prac-.

' tical embodiment of our invention, we do not limit ourselves strictly toexact details herein illustrated since, manifestly, the same can be varied considerably without departing from the spirit of the invention as defined in the appended claims.

Having described our invention, what we claim as new and desire to secure by Letters liat-ent of the United States is 1. In a device of the character described, a casting, means for securing said casting to a panel, a shaft positioned in said means, self supporting, fixed, flat coils mounted on said casting, a movable coil, means for mounting said movable coil on said shaft, said means comprising a circular collar detachably secured to said shaft and positioned at an angle of 2L5 degrees to the shaft.

2. In a device of the character described, a casting, means for securing said casting to a panel, a shaftpositioned in said means,

self supporting, fixed, flat coils mounted on said casting, a movable coil, means for mounting said movable coil on said shaft, said last mentioned means comprising a circular collar detachably secured to said shaft and positioned atan angle of 45 degrees to the shaft, and means for limiting the rotation of said shaft and holding the same in any adjusted position.

In a device of the character described, a casting comprising a vertical body portion and a fork, said fork extending from the upper end of said body portion and inclined thereto, a boss on the lower part of said vertical portion, screw threads on the outer surface of said boss, and a bore extending through said boss and body portion, the diameter of the bore through the boss being greater than the diameter of the bore through the body portion.

a. In a device of the character described, a collar comprising a circular body portion, a knob extending from the rear face of said body portion, a bore drilled at an angle of degrees to the body portion extending through said knob, a set screw positioned in said knob, and a screw threaded opening in the front face of said body portion.

In testimony whereof we afiix our signatures.

BENJAMIN W. SUCKLE. THOMAS J. MATHEWS. 

